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authorJon Mason <jon.mason@exar.com>2010-12-10 15:40:01 +0000
committerDavid S. Miller <davem@davemloft.net>2010-12-11 11:46:36 -0800
commit1853e2e15dc95ff3430530941b5856581251ef70 (patch)
tree0ae74601e624a49ebab41de725e2793fbfddb564 /drivers/net/s2io.c
parent9835fd7321a67feba6432e63bf2cba43f5a56bd9 (diff)
s2io: rx_ring_sz bounds checking
modparm rx_ring_sz can be set to be greater than the maximum allowable number of blocks. This results in an array overrun when probing the driver, and causes memory corruption. Also, the MAX_RX_DESC_1 multiply the max number of rings by max number of blocker per ring by 127, but the driver does the same calculation with 127+1. This results in the possibility of the value being set being larger than the maximum allowable value. Finally, clean-up the s2io_ethtool_gringparam code to be more intuitive. Signed-off-by: Jon Mason <jon.mason@exar.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/s2io.c')
-rw-r--r--drivers/net/s2io.c40
1 files changed, 24 insertions, 16 deletions
diff --git a/drivers/net/s2io.c b/drivers/net/s2io.c
index 0f4219cb0be2..a6d3eaf44863 100644
--- a/drivers/net/s2io.c
+++ b/drivers/net/s2io.c
@@ -5568,30 +5568,27 @@ static void s2io_ethtool_gringparam(struct net_device *dev,
struct s2io_nic *sp = netdev_priv(dev);
int i, tx_desc_count = 0, rx_desc_count = 0;
- if (sp->rxd_mode == RXD_MODE_1)
+ if (sp->rxd_mode == RXD_MODE_1) {
ering->rx_max_pending = MAX_RX_DESC_1;
- else if (sp->rxd_mode == RXD_MODE_3B)
+ ering->rx_jumbo_max_pending = MAX_RX_DESC_1;
+ } else {
ering->rx_max_pending = MAX_RX_DESC_2;
+ ering->rx_jumbo_max_pending = MAX_RX_DESC_2;
+ }
+ ering->rx_mini_max_pending = 0;
ering->tx_max_pending = MAX_TX_DESC;
- for (i = 0 ; i < sp->config.tx_fifo_num ; i++)
- tx_desc_count += sp->config.tx_cfg[i].fifo_len;
- DBG_PRINT(INFO_DBG, "max txds: %d\n", sp->config.max_txds);
- ering->tx_pending = tx_desc_count;
- rx_desc_count = 0;
- for (i = 0 ; i < sp->config.rx_ring_num ; i++)
+ for (i = 0; i < sp->config.rx_ring_num; i++)
rx_desc_count += sp->config.rx_cfg[i].num_rxd;
-
ering->rx_pending = rx_desc_count;
-
- ering->rx_mini_max_pending = 0;
- ering->rx_mini_pending = 0;
- if (sp->rxd_mode == RXD_MODE_1)
- ering->rx_jumbo_max_pending = MAX_RX_DESC_1;
- else if (sp->rxd_mode == RXD_MODE_3B)
- ering->rx_jumbo_max_pending = MAX_RX_DESC_2;
ering->rx_jumbo_pending = rx_desc_count;
+ ering->rx_mini_pending = 0;
+
+ for (i = 0; i < sp->config.tx_fifo_num; i++)
+ tx_desc_count += sp->config.tx_cfg[i].fifo_len;
+ ering->tx_pending = tx_desc_count;
+ DBG_PRINT(INFO_DBG, "max txds: %d\n", sp->config.max_txds);
}
/**
@@ -7692,6 +7689,8 @@ static void s2io_init_pci(struct s2io_nic *sp)
static int s2io_verify_parm(struct pci_dev *pdev, u8 *dev_intr_type,
u8 *dev_multiq)
{
+ int i;
+
if ((tx_fifo_num > MAX_TX_FIFOS) || (tx_fifo_num < 1)) {
DBG_PRINT(ERR_DBG, "Requested number of tx fifos "
"(%d) not supported\n", tx_fifo_num);
@@ -7750,6 +7749,15 @@ static int s2io_verify_parm(struct pci_dev *pdev, u8 *dev_intr_type,
DBG_PRINT(ERR_DBG, "Defaulting to 1-buffer mode\n");
rx_ring_mode = 1;
}
+
+ for (i = 0; i < MAX_RX_RINGS; i++)
+ if (rx_ring_sz[i] > MAX_RX_BLOCKS_PER_RING) {
+ DBG_PRINT(ERR_DBG, "Requested rx ring size not "
+ "supported\nDefaulting to %d\n",
+ MAX_RX_BLOCKS_PER_RING);
+ rx_ring_sz[i] = MAX_RX_BLOCKS_PER_RING;
+ }
+
return SUCCESS;
}